In this trailer released by WB, Dumbledore narrates the story of Tom Riddle. We see glimpses of the inferi, more orphanage footage, the gates of Hogwarts as Harry and Luna travel up to them, Harry under his invisibility cloak on the train, Dumbledore grabbing a chain from the cave, a close shot of Narcissa, Draco working on the wardrobe, explosions in Diagon Alley and fire at the Burrow, Harry battling off the Inferi, Fenrir Greyback, Harry shouting at Snape, the bridge collapsing, and another “Once again, I must ask too much of you, Harry.”